Physics Trivia

15 Points Per Correct Answer - No time limit  

1. Which of the following is a scalar quantity? the heat needed to boil some water the effort needed to hammer a nail into wood the braking force needed to stop a car the thrust needed to lift a rocket off the ground

2. The electromotive force induced in a conductor moving at right angles to a magnetic field does not depend upon the resistance of the conductor the speed of the conductor the length of the conductor the strength of the magnetic field

3. In which of the following is a force of friction necessary? when a rocket is taking off when a ball is bouncing off a wall when a car is accelerating when a drum skin is vibrating

4. The half-life of isotope X is four days and its initial mass is 32mg. What mass of isotope X will remain after 12 days? 4 mg 12 mg 8 mg 16 mg

5. What is emitted by the hot metal filament in the cathode ray tube? a-particles electrons protons X-rays

6. What is the current in a 5.0 ohm resistor when the potential difference between the ends of the resistor is 2.5 V? 2.0 A 0.50 A 2.5 A 12.5 A

7. Which fuse should be used for a 750 W electric iron connected to a 240 V supply? 3 A 5 A 10 A 13 A

8. On what does the quality (timbre) of a sound wave depend? The size of the wave The shape of the wave The speed of the wave The frequency of the wave

9. Watt-second can be used as a unit of energy. Yes No

10. An electric lamp uses energy at the rate of 48 W on a 12 V supply. How much charge passes through the lamp in 2.0 seconds? 8 coulombs 48 coulombs 4 amperes 8 amperes